The Collaborative International Dictionary of English v.0.48:

Almude \Al*mude"\, n. [Pg. almude, or Sp. almud, a measure of
   grain or dry fruit, fr. Ar. al-mudd a dry measure.]
   A measure for liquids in several countries. In Portugal the
   Lisbon almude is about 4.4, and the Oporto almude about 6.6,
   gallons U. S. measure. In Turkey the "almud" is about 1.4
   gallons.
   [1913 Webster] Almug